This set of Audio Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Types of Optical Recording of Sound and Disc”.
1. With which material is a photographic film strip coated on one side of photographic film in optical recording of sound?
a) Silver halide crystals
b) Silver chlorine crystals
c) Silver iodide crystals
d) Silver bromide crystals
View Answer
Explanation: Photographic film is a strip or sheet of transparent plastic film base coated on one side with gelatin emulsion containing microscopically small light sensitive silver halide crystals. The size and other characteristics of the crystals are determined by sensitivity, contrast and resolution of the film.
2. By converting which signals into variations of light intensity falling onto the film is recording on photographic film donein optical recording of sound?
a) Video
b) Audio
c) Both video and audio
d) Transmission
View Answer
Explanation: Recording on photographic film is done by converting audio signals into variations of light intensity falling onto the film. This recording of the sound appears as the soundtrack, 2.5 mm wide near one edge of the movie film.
3. What is a small, portable and round medium made of molded polymer for electronically recording, storing, and playing back audio, video, text and other information in digital form in optical recording of sound?
a) CD
b) DVD
c) Audio player
d) Video Player
View Answer
Explanation: There are two types of optical recording of sound:
i. Recording on photographic films.
ii. Recording on compact discs.
A compact disc (CD) is a small, portable, round medium made of molded polymer for electronically recording, storing, and playing back audio, video, text and other information in digital form.
4. Recording on CD is done using laser beams in optical recording of sound.
a) True
b) False
View Answer
Explanation: A molded plastic disc containing digital data on it is scanned by a laser beam. Recording on CD is done by using laser beams. This laser beam falls on a rotating disc and thus it causes bits of varying width and fixed depth. Thus it records in a binary form. Flats and pits make respectively 1s and 0s in binary.
5. Up to how many minutes a standard compact disc can hold up in optical recording of disc?
a) 50
b) 60
c) 70
d) 80
View Answer
Explanation: Compact disc is a digital disc data storage format that was developed to store and play only sound recordings but now it is used for storage of data as well. Standard CDs have diameter of 120 mm and can hold up to 80 minutes of uncompressed audio.
6. Which surface of a CD is covered with microscopic bumps called ‘pits’ and ‘lands’ in optical recording of disc?
a) Lower
b) Upper
c) Front
d) Back
View Answer
Explanation: The lower surface of a CD is covered with microscopic bumps called pits and lands. These bumps, stamped on to the aluminum surface represent the binary data. Each pit/land and land/pit step represents a single binary 1. Flat areas of pits and lands represent a sequence of binary 0s.
7. Which two companies were pioneers in developing projects to record sound in digital form which give birth to the compact disc system in October 1982?
a) Philips and Sony
b) Dell and HP
c) Acer and HP
d) Sony and Intel
View Answer
Explanation: As the digital circuits provide total immunity to the noise, the development of recording sound in digital form was found and the resultant is the laser discs. Phillips and Sony were pioneers in development projects to record sound in digital form which gave birth to the compact system in October 1982.
8. In a CD, music is stored digitally.
a) True
b) False
View Answer
Explanation: LP records (long playing records) stored music as bumps on the surface of plastic, while cassettes stored it using patterns of magnetism. These are called analog technologies, because the sound is stored as a continuously varying pattern. In a CD, music (or other information) is stored digitally (as a longest string of numbers).
9. What will be the length of a track of data if it is stretched out in a CD in optical recording of disc?
a) 15 KM
b) 5 KM
c) 4 KM
d) 35 KM
View Answer
Explanation: Data is read by focusing the laser on the disc surface and measuring the changes in the reflected light caused by the pit/land boundaries. These changes are converted into the sequence of 1s and 0s. CDS use a single track of data in the form of a spiral. If the track is stretched out, it will be almost 5 KM long.
10. How many discs can be made from a master disc in optical recording of disc?
a) Singles
b) Hundreds
c) Thousands
d) Millions
View Answer
Explanation: Once the master disc has been made, it is used to stamp out millions of plastic-duplicates the CDs that you buy and put in your music player or computer. Once each disc is pressed, it is coated with a thin aluminum layer, covered with protective polycarbonate and lacquer, and the label is printed on top.
11. Which discs are virtually extinct now and have been replaced by compact discs (CDs) since many years due to numerous advantages they offer?
a) Gramophone discs (LPs)
b) Flutter discs
c) Dynamic discs
d) Blu-ray discs
View Answer
Explanation: The gramophone discs (LPs) are virtually extinct now and have been replaced by compact discs (CDs) since many years due to numerous advantages they offer. Low distortion, small size, dynamic range, very high SNR and increased storage capacity are some of the advantages of compact discs.
Sanfoundry Global Education & Learning Series – Audio Engineering.
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